# What plugin should I use to read math expression

I am a newbies of this site. Please, help me to read the math expressions in "non-plain" text form like this:

$$a=\left(\sum_i y_i b^{x_i}\right) / \left(\sum_i b^{2x_i}\right)$$

What addin, application will help me to read this and other expressions in "normal" or professional (as msword mentions) form?

Thank you.

I saw this one:

And now I see this one:

I have resolved this problem by using Google Chrome or Latex Composer add-on for Firefox and this editor

• What does "normal" mean? If you need the $\TeX$ code behind, right click on any expression and click "Show Source". – J. M. is a poor mathematician Dec 5 '10 at 13:57
• @J.M. addons.mozilla.org/en-US/firefox/addon/4082 Thank you!!! – igor Dec 5 '10 at 15:50
• Can you attach a screenshot or picture of what you are seeing and what you would like to see instead? – Rahul Dec 5 '10 at 19:21
• @Rahul Narain I have resolved this problem, see my updated question – igor Dec 5 '10 at 19:45
• You shouldn't have been seeing that in the first place! Can you try removing the LaTeX Composer plugin and doing a hard refresh (instructions here: en.wikipedia.org/wiki/…)? – Rahul Dec 5 '10 at 19:48
• @Rahul Narain I got error message: Your browser does not support MathJax :(. – igor Dec 5 '10 at 19:55
• Wow, what version of Firefox are you using? – Rahul Dec 5 '10 at 19:58
• @Rahul Narain latest (3.6.12)... I know this is a strange bug in FF: it shows that I am using (3.6.12), but some sites detects my browser version as less than 2.0...:( I am going to reinstall it. :) – igor Dec 5 '10 at 20:01
• That is very strange! I'm afraid I'm out of specific ideas now. You could try going through the various troubleshooting steps listed at support.mozilla.com/en-US/kb/Basic%20Troubleshooting, particularly the one under "Make a new profile". – Rahul Dec 5 '10 at 20:15
• Additionally... what OS are you on? – J. M. is a poor mathematician Dec 5 '10 at 21:00
• @J. M. Windows XP – igor Dec 5 '10 at 22:14
• Can you check other browsers you may have installed to see if those have the same problem? – J. M. is a poor mathematician Dec 6 '10 at 0:19
• @J.M. On Google Chrome it works perfectly! – igor Dec 6 '10 at 0:44